ABL77 Service Manual
Chapter 4: Test and Calibration Procedures
Heater Circuit,
Continued
Step Action
2.
Upon entry to the
Hardware
screen the
Heater ON
button is off.
NOTE:
Five minutes prior to an auto-calibration, the heater is
automatically turned on. During this time period, the heater check box
on the
Hardware
screen is disabled. To continue with this procedure,
allow the analyzer to calibrate then return to this
Hardware
screen.
The
Th
indicator on the display will display
100
if a sensor cassette is
not attached. The
Th
indicator will display ambient temperature if a
sensor cassette is attached (see Figure 4-11). For example, if the
temperature is 25
°
C
,
then the
Th
window will display a value of 25.0
Figure 4-11
3.
Attach a sensor cassette.
4.
Press the
Heater ON
check box to activate the heater circuit (see
Figure 4-12). This causes heat to be applied to the sensor cassette. The
thermistor value (Th) will stabilize between
36.8 – 37.2
.
Figure 4-12
Verify the
heater circuit
(continued)
Continued on next page
Rev. F
4-37